Engineer&#39;s safety-throttle for locomotive dry pipes



J. W. HARTMAN. ENGINEERS SAFETY THROTTLE FOR LOCOMOTIVE DRY PIPES.

APPLICA'i'ION FILED JUNE 21, I9I9- 1,358,844, Patented Nov. 16, 192

wuc ntoz J 14 fiar f/m attozuu UNITED STATES" JOHN WESLEY HARTMAN, OF HOUSTON, TEXAS, ASSIGNOR OF ONE-HALF TO HENRY T.

PATENT OFFICE.

DOBBINS, OF LAFAYETTE, LOUISIANA.

ENGINEERS SAFETY-THROTTLE FOR LOGOMOTIVE DRY PIPES.

Specification of Letters Patent.

Patented Nov. 1c, 1920.

To all whom it may concern:

Be it known that I, JOHN W. HARTMAN, a citizen of the United States, residing at Houston, in the county of Harris and State of Texas, have invented certain new and useful Improvements in Engineers Safety- Throttles for Locomotive Dry Pipes, of which the following is a specification, reference being had to the accompanying drawings.

.This invention relates to locomotive engines, and particularly to the dry pipe thereof.

The general object of this invention is to provide a valve whereby the entrance of steam to the dry pipe of a locomotive engine may be cut off in case of derailment and eliminate any possible chance for accident from escaping steam, and which will further permit repairs being made on pipe connec tions to air pump, injector, etc, while steam is kept up in the boiler.

A further object is to provide a construc tion of this kind which is very simple, may be readily applied to locomotives now in use, and which may be also used with stationary engines.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a longitudinalsectional view of a locomotive boiler provided with my dry pipe throttle; and

Fig. 2 is a fragmentary sectional view of the inlet end of the dry pipe and the valve therefor.

Referring to these drawings,10 designates the boiler of a locomotive engine having the usual steam dome 11. From this steam dome extends the usual throttle stand pipe 12, the entrance of steam to which is controlled by the throttle valve 13 operated by the throttle valve rod 14 extending to the throttle valve handle 15 into the cab of the locomotive.

through the boiler and through the front sheet thereof and pivotally connected to an operating lever 22. The bell crank 20 is mounted on a bracket 23.

Normally the throttle valves 18 are open so that the dry steam will pass into the fountain dry pipe 16 and thence into the steam fountain 241 and then into the steam pipes, injector, etc. It will be seen that my mechanism provides a safety device which, in case of derailment, will protect the engine crew from being injured by escaping steam. The throttle valve lever 22 can be readily operated in case of accident to thereby close the throttle and cut off the steam at the entrance of the fountain dry pipe. This eliminates all possible chance of accident from escaping steam in case of broken pipes in the cab except, of course, the bottom and top water glass cocks and the gage cocks. Furthermore this throttle valve can be closed in case repairs are to be made on the pipe connections to the air pump and injector without reducing the pressure of steam in the boiler. At the present time, in case these repairs have to be made, the steam has to be allowed to escape from the boiler or the fires drawn. It will be obvious that this device is very simple in construction, that it may be readily installed on all locomotives using a dry pipe with but little extra expense, and that it is thoroughly effective for the purpose intended.

I claim 1. A locomotive having a steam dome and a fountain dry pipe extending rearward from the steam dome and disposed within the boiler and opening at its rear end at the rear end of the boiler, said dry pipe within the dome being formed with two alined valve seats constituting ports opening into the dome, a pair of valves controlling inlet through said seats, a bell crank operatively connected to the stem of said valves, a rod operatively connected to the valves to shift them to cause the opening or closing of the valves as the rod is shi ted, said rod extending rearwardly through the boiler sheet of the locomotive, and a handle disposed exteriorly of the rear end of the boiler in immediate proximity to the throttle valve handle for operating the rod.

2. A locomotive having a boiler and a steam dome, a throttle valve handle at the end of the boiler, a fountain dry pipe extending; rearward from the steam dome and opening tothe exterior of the boiler at the rear end thereof. said dry pipe within the dome being formed With a valve seat constituting a port opening into the dome, a valve controlling the inlet of steam through said seat into the dry pipe, a rod disposed Within the boiler and operatively connected to the Valve to shift it to cause the opening or closing of the valve as the rod is shifted, said rod extending rearwardly through the boiler sheet of the locomotive, and a handle disposed exteriorly of the rear end of the, boiler for shifting said rod, said handle being disposed in proximity to the throttle Valve handle. V

In testimony whereof I hereunto affix my signature in the presence of two Witnesses.

JOHN WESLEY HABTMAN. Witnesses :7

F. X. MEYERs, W. STEPHENSON. 

